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Silent variant in F...
Silent variant in F8:c.222G>T (p.Thr74Thr) causes a partial exon skipping in a patient with mild hemophilia A
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- Letelier, Anna (author)
- Lund University,Lunds universitet,Pediatrisk hematologi,Forskargrupper vid Lunds universitet,Paediatric Haematology Research Unit,Lund University Research Groups,Skåne University Hospital
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- Ljung, Rolf (author)
- Lund University,Lunds universitet,Pediatrik, Lund,Sektion V,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Pediatrisk hematologi,Forskargrupper vid Lunds universitet,Paediatrics (Lund),Section V,Department of Clinical Sciences, Lund,Faculty of Medicine,Paediatric Haematology Research Unit,Lund University Research Groups
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- Olsson, Anna (author)
- Sahlgrenska University Hospital
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- Andersson, Nadine G (author)
- Lund University,Lunds universitet,Pediatrisk hematologi,Forskargrupper vid Lunds universitet,Paediatric Haematology Research Unit,Lund University Research Groups,Skåne University Hospital
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(creator_code:org_t)
- 2021-12-28
- 2022
- English.
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In: Molecular Genetics & Genomic Medicine. - : Wiley. - 2324-9269. ; 10:1
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Abstract
Subject headings
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- One of the challenges of genetic testing in patients with hemophilia A is the interpretation of sequence variants. Here we report a silent variant found in exon 2 in the F8 gene in a 47-year-old patient with a previous von Willebrand disease (VWD) type 1 diagnosis. Clinically he had mild bleeding symptoms restricted to prolonged bleeding from minor wounds. Sanger sequencing of F8 gene using genomic DNA showed a hemizygous silent variant in exon 2: c.222G>T, p.Thr74Thr. When applying ACMG criteria, the variant was predicted to be "likely benign" in the analyzing software or VUS after curating. Sanger sequencing of the patient's cDNA after nested polymerase chain reaction showed that the patient had both a normal transcript containing exons 1-4 and a defect transcript lacking exon 2. These findings explain the patient's low FVIII:C level and led to the diagnosis of mild hemophilia A instead of VWD type 1. This case illustrates that mRNA work-up may be needed to clarify a patient's phenotype-genotype.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Hematologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Hematology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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